Design Review of NRF51822-QFAA board

[tamojit]

Hello,

Greetings from India!

I would like to have my design review by your engineers or any concerned person in the related field. The design is not yet complete but the reference layout is taken from here.
I am using inverted F antenna with default passive pi-network as given in the reference layout.

I have attached the gerbers below at your perusal for review.

Please provide me with the detailed analysis as I am a beginner in the RF world. Also I do not have any spectrum analyzer to carry out any necessary testing. If possible please provide me with a correct design(preferred in EagleCAD) .

Below is the snapshot of the board designed in Eagle.

Hoping to hear from you soon.

Tracker.zip

[haakonsh]

I urge you to stick to 0402 components in the balun and filter network. Otherwise it looks good.

Have you calculated the impedance of the transmission line between the balun/filter and the antenna? 

[tamojit]

Is there any issue that I can face with 0603 components?
And about the impedance of the antenna. I haven't calculated yet.

[haakonsh]

No 0603 are fine as well. It's just more difficult to tune the balun/filter with components smaller than 0402 or bigger than 0603. You might not need to have the balun/filter tuned at all though.

[tamojit]

The board is still in design phase, and I am pretty noob in RF antenna design. Can you help me in measuring the impedance of the antenna?
If after fabrication of the board it it turns out that the impedance of the antenna is less than 50ohm, what should I do?

[tamojit]

I have updated the board layout by adding a shunt capacitor. Please have look.